Re: Running Gate 3.0 with Tomcat 5.0

[Isabel M. <ism...@ma...>]

Ian, 

Thanks for your help. Pardon my limited knowledge about servlets, which package do I import so I can use ServletContext? I cannot compile my java bean without the appropriate import statement and I can't seem to find the right package.

Thanks,
Isabel

----- Original Message -----
From: Ian Roberts <i.r...@dc...>
Date: Wednesday, January 26, 2005 12:43 pm
Subject: Re: Running Gate 3.0 with Tomcat 5.0

> On Wednesday 26 Jan 2005 16:32, Isabel Moyo wrote:
> > Thanks for pointing me to the User Guide, I had no idea there were
> > instructions for configuring Tomcat. I'm not sure about the 
> "Initializing> code" section of the User Guide and how it relates 
> to my web application. I
> > am using JSP and Java Beans. I have StandAloneAnnie setup as a 
> Java Bean
> > with JSP pages calling its methods. Do I have to extend 
> GenericServlet as
> > shown in the Initialization code of the User Guide? If not 
> please let me
> > know how to initialize Gate from within a java bean.
> 
> You could put the initialization code into a static method of your 
> bean:
> public class ANNIEBean {
>  private static boolean gateInited = false;
> 
>  public static void init(ServletContext ctx) throws 
> ServletException, 
> IOException {
>    if(!gateInited) {
>      Gate.setGateHome(
>        new File(ctx.getRealPath("/WEB-INF")));
>      Gate.setPluginsHome(
>        new File(ctx.getRealPath("/WEB-INF/gate-plugins")));
>      Gate.setSiteConfigFile(
>        new File(ctx.getRealPath("/WEB-INF/site-gate.xml")));
>      Gate.setUserConfigFile(
>        new File(ctx.getRealPath("/WEB-INF/user-gate.xml")));
> 
>      Gate.init();
>      // load plugins
>      Gate.getCreoleRegister().registerDirectories(
>        ctx.getResource("/WEB-INF/gate-plugins/ANNIE"));
> 
>      gateInited = true;
>    }
>  }
> 
> // other methods go here..., initAnnie, execute, etc.
> }
> 
> Then at the top of each JSP page, put
> <% ANNIEBean.init(application); %>
> 
> This will ensure that GATE is initialized by the time you want to 
> use it (and 
> the init() method shown above will only initialize GATE if this 
> hasn't 
> already been done).
> 
> There is one important caveat worth mentioning: GATE processing 
> resources are 
> *not* thread safe - bad things will happen if you allow two 
> concurrent 
> requests to use the same instance of the ANNIE 
> SerialAnalyserController.  An 
> easy way to get around this initially is to make initAnnie(), 
> execute() etc. 
> synchronized methods, but you will need to jump through a few more 
> hoops if 
> you need to be able to handle concurrent requests.
> 
> Ian
> 
> -- 
> Ian Roberts               | Department of Computer Science
> i.r...@dc...  | University of Sheffield, UK
>